US4668577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene filaments and their production
Assignee: Toyobo Co Ltd
•
Filing: 1986-01-24
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Granted: 1987-05-26
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Expires: 2006-01-24
Abstract
Abstract Crosslinked polyethylene filaments made of polyethylene having an average molecular weight of not less than 4×10 5 , which are stretched and crosslinked by irradiation of radioactive rays and have a strength of not less than 20 g/d and an initial modulus of not less than 400 g/d.
Inventors
- 👤 Toshihiko Ohta
- 👤 Fujio Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:58
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01D; D01D10/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
Crosslinked polyethylene filaments made of uncoated polyethylene which is stretched and subsequently crosslinked by irradiation of radioactive rays, said uncoated, stretched and crosslinked filaments having an average molecular weight of not less than 4×10 5 , a tensile strength of not less than 20 g/d and an initial modulus of not less than 400 g/d.
Claim 2
Dependent Claim
55 words
Crosslinked polyethylene filaments made of uncoated polyethylene which is stretched and subsequently crosslinked by irradiation of radioactive rays, said uncoated, stretched and crosslinked filaments having an average molecular weight of not less than 4×10 5 , a tensile strength of not less than 20 g/d and an initial modulus of not less than 400 g/d.
Claim 3
Independent Claim
75 words
A method of producing uncoated, crosslinked polyethylene filaments having high strength, high modulus, excellent heat resistance and size stability, comprising the steps of: stretching uncoated polyethylene filaments; and irradiating the stretched uncoated polyethylene filaments with radioactive rays such that said stretched and irradiated filaments have an average molecular weight of not less than 4×10 5 , a textile strength of not less than 20 g/d and an initial modulus of not less than 400 g/d.
Claim 4
Independent Claim
75 words
A method of producing uncoated, crosslinked polyethylene filaments having high strength, high modulus, excellent heat resistance and size stability, comprising the steps of: stretching uncoated polyethylene filaments; and irradiating the stretched uncoated polyethylene filaments with radioactive rays such that said stretched and irradiated filaments have an average molecular weight of not less than 4×10 5 , a textile strength of not less than 20 g/d and an initial modulus of not less than 400 g/d.
References Cited (Backward Citations)
US3886056A
Cited
US4563392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |